QT5 installed, Qt 4.8.3 Sys Release listed, normal ? <SOLVED>

While compiling my first created app, it is saved in a folder a build-desktop 4.8.3_in_Path_sys_release...
I had also install a previous version 4.
Is my created app, compiled using the QT 5 or 4 creator version ?
Tks

There's not reason to ask to uninstall Qt 4 when using Qt 5. You can have both on the same system. The only thing to be aware of is to not use a library build with Qt 4 in a Qt 5 project and vice versa.